Exposure to other natural radiation, sequela

This code signifies a long-term or residual health condition resulting from exposure to natural radiation sources other than radon. These sequelae are chronic effects that manifest after the initial exposure event has passed, and are not acute radiation sickness.

Assign this code when documenting a current health problem directly attributed to a past exposure to natural radiation, such as cosmic radiation, terrestrial radiation (excluding radon), or naturally occurring radioactive materials. This would apply to conditions like certain cancers or organ damage that developed years after the initial exposure.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., C00-D49 for neoplasms).
• Ensure documentation clearly links the current condition to a past exposure to natural radiation.
• Do not use for acute radiation effects or for sequelae of man-made radiation exposure.